
Research is the foundation of One Plus One's practical work: monitoring marriage and longterm partnerships, to see how they are changing, what factors cause breakdown, and how people stay together. It undertakes its own original projects and also draws together other research from the UK and abroad, presenting it in a way that policy makers and the public can understand. The nature of its research work informs both national policy and practical initiatives at community level.
One Plus One's research findings are the basis for working projects created by the practice development team to support couples and families. This may involve, for example, training health professionals and others working with families to identify relationship difficulties and to offer effective, acceptable and accessible support to those families. Because its practical projects are grounded in research, they are informed and more likely to be achievable.

Growing together, or drifting apart? Children with disabilities and their parents' relationship
(Glenn, 2007)
Growing Together, or Drifting Apart? draws on extensive available evidence to review the impact of having a child with a disability on the couple relationship More+
Informing unmarried parents about their legal rights at birth registration
(R.Panades, R.Corney, C.Ayles, J.Reynolds, F.Hovsepian, 2007)
This project sought to find out what unmarried parents know about their legal rights and examined the impact of providing legal information on knowledge and behaviour. Full report (pdf, 587k)
Developing resources on family conflict: The missing link in parenting education and support
(Corney, Negreira & Ayles, 2006)
Developing a training package and video resource to help community workers to support parents who are experiencing relationship conflict and to improve outcomes for their children. Executive summary (pdf, 209k)
Parent conflict: Reducing the fallout for children and adults
(Corney, Negreira & Ayles, 2006)
Developing the support available for parents in conflict through: parent education; home visiting support; and developing the skills of workers operating in community and health facilities. Full report (pdf, 365k); Executive summary (pdf, 136k)
The impact of breast cancer on couple satisfaction and quality of life: A review of the literature
(Corney, 2005)
A literature review focusing on influences on the quality and stability of relationships and how couples can be supported. Full report (pdf, 467k); Executive summary (pdf, 184k)
Telephone helpline support for individuals with couple relationship problems
(Corney, 2004)
Examining the use of helplines by individuals who are experiencing relationship problems and to use that information to develop ways of improving the nature and quality of support for couples. Full report (pdf, 406k); Executive summary (pdf, 131k)
Biographical determinants of marital quality
(Ayles, 2004)
Used a large longitudinal dataset to examine how key predictors of relationship stability affect relationship quality. Full report (pdf, 502k)
Provision of training and resource materials to support community family workers in responding to couple relationship difficulties
(Ayles, 2003)
The implementation and evaluation of a pilot training course for Home-Start family group workers. Full report (pdf, 275k)
Better partners, better parents, better health: A good practice guide for primary care
(Reynolds, Ayles & Tucker-Brown, 2002)
Aimed to develop a package of training and resources to support health professionals in their work with couples experiencing relationship difficulties. Full report (pdf, 305k)
Not in front of the children?
(Reynolds (ed.), 2001)
This book summarises more than 200 research findings relating to conflict in families and how it affects children. More+
Identifying and Managing Patients' Relationship Problems in Primary Care
(Ayles & Reynolds, 2001)
This study explored the attitudes and experiences of health professionals and counselling services towards managing clients with relationship problems and examined when and how clients are referred for counselling. Download: Full report (pdf, 676k); Exec Summary (pdf, 64k)
Post-natal screening study
(Simons & Reynolds, 2001)
Randomised controlled trial using health visitors to screen mothers for relationship difficulties. More+
Using non-professional lay workers in family support: The Community Mothers project
(Simons & Reynolds, 2000)
Adapted and extended training and materials to assist lay workers supporting young parents. More+
Research-Based Guidance To Professionals Involved With The Effects Of Family Breakdown On Children
(Dr Deirdre Morrod, et al, 1999)
A report of a study on how primary care workers and other professionals such as teachers and solicitors could be helped to make the best use of research on the effects of family breakdown on children. More+
High divorce rates: The state of the evidence on reasons and remedies
(Simons (ed.), 1999)
One Plus One has completed the most comprehensive review ever undertaken of research evidence from the UK and overseas on the causes of relationship breakdown and the effectiveness of remedies that aim to prevent it. All 7 papers are free to download. More+
Evaluation of The Brief Encounters Training Course
(Corney, 1998)
Independent evaluation of One Plus One's Brief Encounters training, conducted by Professor R Corney, University of Greenwich. Full report (pdf, 3.2mb); Executive summary (pdf, 254k)
Marital Breakdown and the Health of the Nation
(McAllister (ed.), 1995)
A review of a wide range of epidemiological research from Great Britain, the United States and Europe, illustrating the effect of marital breakdown on the health of both adults and children. More+
The Relationship Revolution
(Duncan Dormor, 1992)
This publication examines European couples: cohabiting, marrying and breaking up. More+
The beginning Of the rest of your life? A portrait of newly-wed marriage
(Mansfield & Collard, 1988)
Relates the findings from an intensive study of the first five years of marriage amongst a group of young couples. More+
Marriages in trouble: The process of seeking help
(Brannen & Collard, 1982)
Explores the experiences of couples who have sought help for marital problems. More+
Who divorces?
(Thornes & Collard, 1979)
Presents the findings from a large-scale survey to discover some of the social and psychological factors associated with divorce. More+